Launching marble upwards - Find speed

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SUMMARY

The discussion centers on calculating the launch speed of a marble that reaches a maximum height of 40 meters. Using the principle of conservation of energy, the initial kinetic energy of the marble at launch can be equated to the potential energy at its peak height. The calculations reveal that the launch speed is approximately 28.0 m/s, while the speed at the halfway point (20 meters) is about 19.8 m/s, demonstrating the conversion of kinetic energy to potential energy throughout the marble's ascent.

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lachlan81
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I cannot work out how to get this question answered.

Question:
A student launches a marble vertically upwards so that it reaches a maximum height of 40m above it's release height. Calculate:

a).The speed of the marble when it is launched.
b). The speed of the marble at the halfway point.:confused:
 
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Try with conservation of energy. What sort of energy does the marble have the instant it is launched? How about the instant it reaches its maximum height?
 
Ok, thanks for your help.:smile:
 

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